Good question on the towing -- wish I had clear answer. Thru your insurance (typically) towing is covered if you have a covered loss. Flat tires and mechanical breakdown are not covered losses. So - adding a road side assistance plan is not a bad idea. I will leave it to others to debate Coachnet vs Good Sam; however, neither one has its own service. They both (probably) use national tow vendors.
Actual Cash Value (ACV) is okay if you bought it right and you paid a good bit down or if you own it outright. All RV's depreciate quickly which means the ACV continues to decline. If the value of the coach declines below the loan value (assuming there is a loan) and if a loss occurs that results in a total loss then you would be upside down on the pay-off. Basically, if you paid the coach outright then you won't be "upside down" but you may surprised how quickly it falls in value. If you do have a loan and you really want peace-of-mind you can ask about gap insurance which covers a portion (or all) of the difference between loan balance versus ACV.